function selectAll(name){
	var checkboxs = document.getElementsByName(name);
	for(i=0;i<checkboxs.length;i++){
		checkboxs[i].checked=true;
	}
}
function selectChange(name){
	var checkboxs = document.getElementsByName(name);
	for(i=0;i<checkboxs.length;i++){
		if(checkboxs[i].checked==true){
			checkboxs[i].checked=false;
		}else{
			checkboxs[i].checked=true;
		}
	}
}